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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
Evolutionary Biology. Changes within a gene pool occurring from generation to generation is called microevolution. Allele frequencies in a population may change due to gene flow, genetic drift, natural selection and mutation. These are referred to as the four fundamental forces of evolution.Note that only mutation can create new genetic variation.The other three forces simply rearrange this variation within and among populations.n genetic drift there is a genetic variation among allele frequencies of that population due to random chance. Therefore a small population would allow for higher chance of sampling error and a change in allele frequencies as a result would lead to a misrepresentation of the parent generations gene pool.